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Updated: Jul 25, 2025

Routine Collection of High-Resolution cryo-EM Datasets Using 200 KV Transmission Electron Microscope
Published on: March 16, 2022
Gun energy filter for a low energy electron microscope
Rudolf M Tromp1, James B Hannon1, Meredith L Dyck2
1IBM T.J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, NY 10598, United States.
Abstract:
In a Low Energy Electron Microscope (LEEM) the sample is illuminated with an electron beam with typical electron landing energies from 0-100 eV. The energy spread of the electron beam is determined by the characteristics of the electron source. For the two most commonly used electron sources, LaB6 and cold field emission W, typical energy spreads ΔE are 0.75 and 0.25 eV at full width half maximum, respectively. Here we present a design for a LEEM gun energy filter, that reduces ΔE to ∼100 meV. Such a filter has been incorporated in the IBM/SPECS AC-LEEM system at IBM. Experimental results are presented and found to be in excellent agreement with expectations.
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